TIDUF18A October 2022 – February 2024
The project is programmed to wait for input voltage to exceed approximately 70 Vrms to drive the in rush relay and clear the trip.
Run the project by clicking .
Apply an input voltage of approximately 120 V. The board comes out of the undervoltage condition and inrush relay is driven. The trip clears, and a small amount of current of approximately 1.3-A RMS is drawn. The watch window looks similar to Figure 5-39. The bus voltage is close to 270 V.
Slowly increase ac_cur_ref to 0.078, that is, 2.4-A input, and the bus voltage rises to 400 V. The voltage and current waveform are shown in Figure 5-40.
SFRA is integrated in the software of this build to verify the designed compensator provides enough gain and phase margin by measuring on hardware. To run the SFRA, keep the project running, and navigate to <Install directory >\C2000Ware_DigitalPower_SDK_<version>\libraries\sfra\gui\SFRA_GUI.exe. The SFRA GUI appears.
Select the options for the device on the SFRA GUI. For example, for F280039, select floating point. Click on Setup Connection. On the pop-up window, deselect the boot on connect option, and select an appropriate COM port. Click OK. Return to the SFRA GUI, and click Connect.
The SFRA GUI connects to the device. A SFRA sweep can now be started by clicking Start Sweep. The complete SFRA sweep takes a few minutes to finish. Activity can be monitored by seeing the progress bar on the SFRA GUI and also by checking the flashing of blue LED on the back on the control card that indicates UART activity. Once complete, a graph with the open loop plot appears. This is similar to the plot seen under DC conditions; however, some additional noise is visible due to AC harmonic frequencies close to the measured frequencies. The BW, PM, and GM numbers are very similar to the DC case.
To bring the system to a safe stop, switch off the output from the AC power supply, thus bringing the input AC voltage down to zero. Ensure that the guiVbus comes down to zero, as well.
Fully halting the MCU when in real-time mode is a two-step process. First, halt the processor by using the Halt button on the toolbar () or by using Target → Halt. Then take the MCU out of real-time mode by clicking on . Finally, reset the MCU () .
Close the CCS debug session by clicking on Terminate Debug Session (Target → Terminate all).